Undefined to void transform

This plugin transforms undefined into void 0 which returns undefined regardless of if it's been reassigned

如果返回的 undefined 被覆盖,该插件会将 undefined 转译成 void 0

示例

输入

foo === undefined;

输出

foo === void 0;

安装

npm install babel-plugin-transform-undefined-to-void

使用

通过 .babelrc(推荐)

.babelrc

{
  "plugins": ["transform-undefined-to-void"]
}

通过 CLI

babel --plugins transform-undefined-to-void script.js

通过 Node API

require("babel-core").transform("code", {
  plugins: ["transform-undefined-to-void"]
});